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Trial of Omicron-specific vaccine booster begun-Moderna
By J.Lo
“Nonetheless, given long-term threat demonstrated by Omicron’s immune escape, we are advancing our Omicron-specific variant vaccine booster candidate and we are pleased to begin this part of our Phase 2 study,” Moderna chief executive Stephane Bancel said US biotech company Moderna has begun clinical trials of booster dose of vaccine designed specifically to combat Omicron variant of coronavirus.
The trials will involve a total of 600 adults half of whom have already received two doses of Moderna’s Covid-19 vaccine at least six months ago, and half of whom have received two doses plus previously authorized booster dose.
The booster specifically targeting Omicron will therefore be evaluated as both third and fourth dose.
The company also reported results on the efficacy against Omicron of the booster that has already been authorized.
It said six months after booster injection, levels of neutralizing antibodies against Omicron were reduced by six times from peak observed 29 days after injection but remained detectable in all participants.
These data were obtained by studying blood of 20 people who received 50 microgram booster, half the amount of first two injections.
Moderna’s statement came the day after rivals Pfizer and BioNTech said they had begun enrollment for clinical trial for an Omicron-specific vaccine.
Both vaccines are based on messenger RNA technology, which makes it relatively easy to update them to keep up with mutations specific to new variants.
Several countries, including United States, have begun to see a decline in cases associated with the infection wave caused by Omicron, the most transmissible variant detected so far, but the number of infections worldwide continues to rise.
